--- a/src/http/ngx_http_variables.c
+++ b/src/http/ngx_http_variables.c
@@ -34,6 +34,10 @@ static ngx_int_t ngx_http_variable_cooki
     ngx_http_variable_value_t *v, uintptr_t data);
 static ngx_int_t ngx_http_variable_argument(ngx_http_request_t *r,
     ngx_http_variable_value_t *v, uintptr_t data);
+#if (NGX_HAVE_TCP_INFO)
+static ngx_int_t ngx_http_variable_tcpinfo(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data);
+#endif
 
 static ngx_int_t ngx_http_variable_host(ngx_http_request_t *r,
     ngx_http_variable_value_t *v, uintptr_t data);
@@ -259,6 +263,20 @@ static ngx_http_variable_t  ngx_http_cor
     { ngx_string("pid"), NULL, ngx_http_variable_pid,
       0, 0, 0 },
 
+#if (NGX_HAVE_TCP_INFO)
+    { ngx_string("tcpinfo_rtt"), NULL, ngx_http_variable_tcpinfo,
+      0, NGX_HTTP_VAR_NOCACHEABLE, 0 },
+
+    { ngx_string("tcpinfo_rttvar"), NULL, ngx_http_variable_tcpinfo,
+      1, NGX_HTTP_VAR_NOCACHEABLE, 0 },
+
+    { ngx_string("tcpinfo_snd_cwnd"), NULL, ngx_http_variable_tcpinfo,
+      2, NGX_HTTP_VAR_NOCACHEABLE, 0 },
+
+    { ngx_string("tcpinfo_rcv_space"), NULL, ngx_http_variable_tcpinfo,
+      3, NGX_HTTP_VAR_NOCACHEABLE, 0 },
+#endif
+
     { ngx_null_string, NULL, NULL, 0, 0, 0 }
 };
 
@@ -384,7 +402,7 @@ ngx_http_get_variable_index(ngx_conf_t *
     v->flags = 0;
     v->index = cmcf->variables.nelts - 1;
 
-    return cmcf->variables.nelts - 1;
+    return v->index;
 }
 
 
@@ -884,6 +902,61 @@ ngx_http_variable_argument(ngx_http_requ
 }
 
 
+#if (NGX_HAVE_TCP_INFO)
+
+static ngx_int_t
+ngx_http_variable_tcpinfo(ngx_http_request_t *r, ngx_http_variable_value_t *v,
+    uintptr_t data)
+{
+    struct tcp_info  ti;
+    socklen_t        len;
+    uint32_t         value;
+
+    len = sizeof(struct tcp_info);
+    if (getsockopt(r->connection->fd, IPPROTO_TCP, TCP_INFO, &ti, &len) == -1) {
+        v->not_found = 1;
+        return NGX_OK;
+    }
+
+    v->data = ngx_pnalloc(r->pool, NGX_INT32_LEN);
+    if (v->data == NULL) {
+        return NGX_ERROR;
+    }
+
+    switch (data) {
+    case 0:
+        value = ti.tcpi_rtt;
+        break;
+
+    case 1:
+        value = ti.tcpi_rttvar;
+        break;
+
+    case 2:
+        value = ti.tcpi_snd_cwnd;
+        break;
+
+    case 3:
+        value = ti.tcpi_rcv_space;
+        break;
+
+    /* suppress warning */
+    default:
+        value = 0;
+        break;
+    }
+
+    v->len = ngx_sprintf(v->data, "%uD", value) - v->data;
+    v->valid = 1;
+    v->no_cacheable = 0;
+    v->not_found = 0;
+
+    return NGX_OK;
+}
+
+#endif
+
+
 static ngx_int_t
 ngx_http_variable_host(ngx_http_request_t *r, ngx_http_variable_value_t *v,
     uintptr_t data)
@@ -1200,10 +1273,13 @@ static ngx_int_t
 ngx_http_variable_realpath_root(ngx_http_request_t *r,
     ngx_http_variable_value_t *v, uintptr_t data)
 {
+    u_char                    *real;
     size_t                     len;
     ngx_str_t                  path;
     ngx_http_core_loc_conf_t  *clcf;
-    u_char                     real[NGX_MAX_PATH];
+#if (NGX_HAVE_MAX_PATH)
+    u_char                     buffer[NGX_MAX_PATH];
+#endif
 
     clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
 
@@ -1225,7 +1301,15 @@ ngx_http_variable_realpath_root(ngx_http
         }
     }
 
-    if (ngx_realpath(path.data, real) == NULL) {
+#if (NGX_HAVE_MAX_PATH)
+    real = buffer;
+#else
+    real = NULL;
+#endif
+
+    real = ngx_realpath(path.data, real);
+
+    if (real == NULL) {
         ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
                       ngx_realpath_n " \"%s\" failed", path.data);
         return NGX_ERROR;
@@ -1235,6 +1319,9 @@ ngx_http_variable_realpath_root(ngx_http
 
     v->data = ngx_pnalloc(r->pool, len);
     if (v->data == NULL) {
+#if !(NGX_HAVE_MAX_PATH)
+        ngx_free(real);
+#endif
         return NGX_ERROR;
     }
 
@@ -1245,6 +1332,10 @@ ngx_http_variable_realpath_root(ngx_http
 
     ngx_memcpy(v->data, real, len);
 
+#if !(NGX_HAVE_MAX_PATH)
+    ngx_free(real);
+#endif
+
     return NGX_OK;
 }